... Material: 45# carbon steel Heat treatment . Black on the surface Sharp Tail Ratchet Wrench Material :45# carbon drop forged steel ,with ... heat treat and black on the surface.Spcification: 10-12mm,11-13mm,12-14mm ,13-15mm,13-17mm,14 ... ,32-36mm,36-41mm Please inquire us for more information . Sharp Tail Ratchet Wrench 10-12mm etc